One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,4)(3,6,7,8)(9,10,12,14)(11,13,15,16)(17,18,20,24)(19,22,28,32)(21,25,31,26)(23,29,27,30)(2,4)(6,8)(9,11)(10,13)(12,15)(14,16)(17,18)(19,27)(20,24)(21,26)(22,29)(23,28)(25,31)(30,32) involution — undirected(1,3,5,7)(2,6,4,8)(10,14)(13,16)(17,19,20,28)(18,22,24,32)(21,30,31,29)(23,26,27,25)(1,4,5,2)(3,6,7,8)(11,15)(13,16)(17,19)(18,23)(20,28)(21,29)(22,25)(24,27)(26,32)(30,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.